Fix battery animation not being played.

- VideoPreference now checks the view visible flag to see if it
should start playing the video when the surface texture is being
updated. Added a default controller for the VideoPreference to
update the view visible flag of the VideoPrefernece when the
setting page is paused/resumed accordingly.
- add the default controller to the adaptive battery video and the
adaptive brightness video.

Change-Id: I1aae2148c27c7157c97541346790542c74377e5a
Fixes: 111103815
Test: make RunSettingsRoboTests

res/xml/auto_brightness_detail.xml

@@ -23,8 +23,10 @@
 
     <com.android.settings.widget.VideoPreference
         android:key="auto_brightness_video"
+        android:title="@string/summary_placeholder"
         settings:animation="@raw/aab_brightness"
-        settings:preview="@drawable/aab_brightness"/>
+        settings:preview="@drawable/aab_brightness"
+        settings:controller="com.android.settings.widget.VideoPreferenceController"/>
 
     <!-- Cross-listed item, if you change this, also change it in power_usage_summary.xml -->
     <com.android.settingslib.RestrictedSwitchPreference

res/xml/smart_battery_detail.xml

@@ -23,8 +23,10 @@
 
     <com.android.settings.widget.VideoPreference
         android:key="auto_awesome_battery"
+        android:title="@string/summary_placeholder"
         settings:animation="@raw/auto_awesome_battery"
-        settings:preview="@drawable/auto_awesome_battery"/>
+        settings:preview="@drawable/auto_awesome_battery"
+        settings:controller="com.android.settings.widget.VideoPreferenceController"/>
 
     <SwitchPreference
         android:key="smart_battery"

src/com/android/settings/widget/VideoPreferenceController.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.widget;
+
+import android.content.Context;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnPause;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+
+import androidx.preference.PreferenceScreen;
+
+public class VideoPreferenceController extends BasePreferenceController implements
+        LifecycleObserver, OnResume, OnPause {
+
+    private VideoPreference mVideoPreference;
+    private boolean mVideoPaused;
+
+    public VideoPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE_UNSEARCHABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mVideoPreference = (VideoPreference) screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public void onPause() {
+        if (mVideoPreference != null) {
+            mVideoPaused = mVideoPreference.isVideoPaused();
+            mVideoPreference.onViewInvisible();
+        }
+    }
+
+    @Override
+    public void onResume() {
+        if (mVideoPreference != null) {
+            mVideoPreference.onViewVisible(mVideoPaused);
+        }
+    }
+
+}

tests/robotests/src/com/android/settings/widget/VideoPreferenceControllerTest.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.widget;
+
+import static com.android.settings.core.BasePreferenceController.AVAILABLE_UNSEARCHABLE;
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.anyBoolean;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+import androidx.preference.PreferenceScreen;
+
+@RunWith(RobolectricTestRunner.class)
+public class VideoPreferenceControllerTest {
+
+    @Mock
+    private VideoPreference mPreference;
+    @Mock
+    private PreferenceScreen mScreen;
+
+    private VideoPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mController = new VideoPreferenceController(RuntimeEnvironment.application, "test_pref");
+        when(mScreen.findPreference(mController.getPreferenceKey())).thenReturn(mPreference);
+    }
+
+    @Test
+    public void getAvailabilityStatus_isAlwaysAvailable() {
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(AVAILABLE_UNSEARCHABLE);
+    }
+
+    @Test
+    public void onPause_shouldCallOnViewInvisibleOnPrefernece() {
+        mController.displayPreference(mScreen);
+
+        mController.onPause();
+
+        verify(mPreference).onViewInvisible();
+    }
+
+    @Test
+    public void onResume_shouldCallOnViewVisibleOnPrefernece() {
+        mController.displayPreference(mScreen);
+
+        mController.onResume();
+
+        verify(mPreference).onViewVisible(anyBoolean());
+    }
+
+}